— Jack, could you tell me _____?

— Sure. In the post office on Green Road. [ ]

A. where you bought the stamps

B. where did you buy the stamps

C. when you bought the stamps

D. when did you buy the stamps

下列哪些属于预防性卫生监督的内容（）

A.学习时间是否合理

B.采光是否符合要求

C.有无常见病防治措施

D.审查新建学校的图纸

E.学生使用的书籍是否符合国家有关卫生标准